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A wire of initial length L0 and radiusr0 has a measured resistance of 4.0 . The wire isdrawn under tensile stress to a new uniform radius of r =0.45r0. What is the new resistance of the wire?
Two violin strings are tuned to the same frequency, 294 Hz. The tension in one string is then decreased by 1.5 %. What will be the beat frequency heard when the two strings are played together.
a person pulls on a 50Kg desk with a 200N force acting at 30 angle above the horizontal. the desk does not budge. draw a force diagram for the desk. Write down the equation that describes the forces which act in the x-direction.
A hoop and a disk, both of 0.70- m radius and 5.0- kg mass, are released from the top of an inclined plane 3.0 m high and 8.2 m long. What is the speed of the hoop
A dead tree is initially stationary and there is a 30.0-degree angle between the tree and the vertical, How fast is the top of the tree moving (in m/s) just before it hits the ground
A .32 caliber bullet fired from a revolver with a 3 in long barrel will have a relatively low muzzle speed of about 200 m/s. how long will whole trip take
An electron is traveling through a region of space in which the electric field is along the +x direction and has a magnitude of 2313 N/C. What is the acceleration of the electron? magnitude m/s2 direction
q1. a car moving at 37 ms approaches a stationary whistle that emits 270 hz sound. the speed of sound is 347 ms. what
Two charged dust particles exert a force of 4.30×10-2 N on each other. What would be the force if they are moved so they are only one-sixth as far apart.
a certain vibrating string on a piano has a length of 74cm and forms a standing wave having two antinodes. a which
A diffraction grating produces a first order bright fringe that is 0.226 m away from the central bright fringe on a flat screen which is 0.675 m away. What is the wavelength of the light shining on the grating
A standard 35mm slide measures 24mm by 36mm. Suppose aslide projector produces a 60cm by 90cm image of the slide on ascreen. The focal length of the lens is 12cm. What is the distance between the slide and the screen
While the dried up seed pod of a scotch broom plant bursts open, it shoots out a seed with an initial velocity of 2.4 m/s at an angle of 60° above the horizontal.
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